Armrest



UNHTEE STATES FA'FENF GEORGE I). HECK, 0F PRINCE BAY, NEVJ YORK, ASSIGNOR- TO THE S. S. WHITE DENTAL MANUIEACTURING- COMIPANY, A CORPORATION OF PENNSYLVANIA.

ARMBEST.

Application filed December 23, 1920. Serial No. 432,679,

To all whom it may concern:

Be it known that I, GEORGE D. Back, a citizen of the United States, and aresident of Prince Bay, in the county of Richmond, State of New York, have invented certain new and useful improvements in Armrests, of which the following is a specification, reference being bid to the accompanying drawings.

My invention relates particularly to that class of arm-rests that conveniently support the arm of the operator while operating upon a patient in a chair, and is especially directed to a reversable arm-rest which may be adjustably supported for the convenience of the operator upon either side of the chair.

The principal objects of my invention are to provide an arm-rest that may be detachably engaged with the head-rest of an operating chair, and which is so constructed as to be conveniently applied to the head-rest on either side of its medial plane and as readily removed therefrom.

Other objects of my invention are to provide an arm-rest with clamping means which are independent of the head-rest frame, for frictirmally securing it to said head-rest frame in such a manner that it may be removed without affecting the adjustment or appearance of the headrest.

Specificially stated, the form of my invention as hereinafter described, comprehends an arm-rest comprising a bracket having lugs arranged to engage the under edges of a head-rest frame, and an overhanging lug forming a finger arranged to engage the upper surface of said head-rest frame, said lugs being forced into frictional engagement with said head-rest frame by asingle setscrew carried by said bracket and arranged to bear against said headrest frame, there by tending to rock said bracket upon said finger.

My invention further includes all of the various novel features of construction and arrangement as hereinafter more definitely specified.

In the accompanying drawings, Figure 1 is an elevational View of a head-rest for an operating chair, showing the operators armrest conveniently attached to the right hand side of the fran'ie thereof; Fig. 2 is a side elevational view of the head-rest and attached arm-rest shown in Fig. 2, the headrest pads being omitted from this view for convenience of illustration; Fig. 3 is a transverse sectional view of the arm-rest bracket and head-rest frame, taken on the line 33 in Fig. 1; and Fig. 4: is a similar view taken on the line 4-4 in Fig. 1.

In said figures, the head-rest which is arranged to be attached to the back of an operating chair in any convenient manner, comprises the standard 1, having the yokebar 2 carrying the swinging cradle 3 which is pivotally supported at its ends by the upturned ends of said yoke-bar, and which carries the head-rest pads 5 and 6.

The arm-rest which may be detachably secured to the yoke-bar 2 comprises the bracket 7 conforming substantially to the curvature of the end portions of the yokebar 2, and having the spindle 8 upon which the arm-rest pad 9 is pivotally supported and retained in position thereon by the retaining screw 1 The bracket 7 is provided at its free lower end with laterally and upwardly projecting terminal lugs 12 and 18, the inner surfaces of which are angularly disposed with respect to each other and arranged to engage the lower edges of the yoke-bar 2, as best shown in Fig. a. Said bracket 7 is also provided intermediate of its length and preferably centrally disposed with respect thereto, with an upwardly projecting lug 15, extending from one side thereof and having an overhanging projection 16 forming a finger arranged to engage the upper surface of said yoke-bar 2, and arranged to afford a fulcrum upon which said bracket may be supported. A set-screw 17 in threaded engagement with the bracket 7 is arranged to be adjusted to ear against the underside of said yoke-bar 2, and tends to rock said bracket upon its fulcrum afforded by the projecting finger 16. Said yoke-bar 2 may preferably be provided with an indentation or recess 18 into which the point of said setscrew 17 may enter, thereby serving as a guide to position said arm-rest and to prevent accidental displacement of said bracket with respect to said yoke-bar 2.

It may be here noted that the finger-forming lug 15 is intermediate of said set-screw 17, and the terminal lugs 12 and 13, so that when said set-screw is adjusted into engagement with the yoke-bar 2, the overhanging projectionforming the finger will be pressed into frictional engagement with the upper surface of the yoke-bar 2'and will thereby tend to cause said bracket to rock thereon as a fulcrum to engage the lugs 12 and 13 With the lower edges of said yoke-bar 2, and said bracket will thereby be clamped to said yoke-bar in rigid relation therewith.

Furthermore, it will be obvious that the bracket 7 may be conveniently attached to either the right hand side as shown in the drawing, or it maybe reversed and applied to the left hand side of the yokebar 2 with equal facility.

My invention is advantageous in that the arm-rest bracket includes means for its attachment and support which are wholly independent of any means which form a part of the head-rest frame, and therefore, may be attached to any head-rest frame that affords a yoke-bar or similar support.

I do not desire to limit my invention to the precise details of construction and arrangement as herein set forth, as it is obvione that various modifications may be made therein without departing from the essential features of my invention as defined in the appended claims.

aving thus described my invention, I claim 1. An arm-rest adapted to be engaged with a suitable support, and having a fulcrum intermediate of its ends arranged to rest upon said support, and means tending to rock it upon said'fulcrum to frictionally engage it with said support.

2. An arm-rest adapted to be engaged, with a suitable support, and having a fulcrum intermediate of its ends upon which said arm-rest tends to rock, and a set-screw adjustable to rock said arm-rest upon said fulcrum and thereby frictionally engage said arm-rest with said support.

3. An arm-rest adapted to be engaged with a suitable support and comprising an overhanging projection forming a fulcrum arranged to engage said support, and means adjustable to rock said arm-rest upon said fulcrum to frictionally clamp said arm-rest in rigid engagement with said support.

4.1 m arm-rest adapted to be engaged with a suitable support and comp-rising a bracket having a lug extended therefrom and arranged to overhang said support and provide a fulcrum for'said bracket, and a set-screw disposed between said fulcrum and one end of said bracket adjustable to rock said bracket upon its fulcrum and thereby frictionally engage the other end of said bracket with said support.

5. An arm-rest adapted to be engaged with a suitable support and comprising a bracket having terminal lugs and an intermediate overhanging projection forming a fulcrum arranged to rest upon said support, and a set-screw adjustable to rock said bracket upon its fulcrum to frictio-nally engage said terminal lugs with said support and thereby rigidly secure said bracket tosaid support.

6. An arm-rest adapted to be engaged with a suitable support and comprising a bracket having laterally-disposed opp0sitely-chamfered lugs, and an overhanging projection forming a fulcrum upon which said bracket may be rocked with respect to said support, and means spaced from said fulcrum adjustable to engage said support and thereby tend to rock said bracket on its fulcrum to frictionally engage said chamfered lugs with said support.

7 In combination with the head-rest frame of an operating chair, of an arm-rest independent thereof and arranged to be engaged therewith, comprising a bracket having an overhanging projection forming a fulcrum intermediate of its ends, and wedging means disposed between said fulcrum and one end, tending to force the last-mentioned end from said frame and thereby rock said bracket upon its fulcrum to frictionally engage the other end with said frame;

In Witness whereof, I have hereunto set my hand this 21 day of December, A. D 1920.

GEORGE D. HECK. Witnesses ALBERT Horrownnm. SAMUEL R. BARTON. 

